MIL-PRF-62321D
3.1.1.6 Wheel splash and stone throw protection. All tilt cabs shall have rubber mud
flaps to the rear of the front wheels. A two-inch wide (minimum) backing strip of corrosion-
resistant material shall be used to prevent mudflap fastening hardware from damaging the
mudflaps. All splash shield and mud flap installations shall conform to the rear wheel splash
and stone throw protection provisions as specified in SAE J682.
3.1.1.7 Trailer towing package. When specified (see 6.2), a trailer towing package
consisting of a pintle, safety chain attachment devices, a seven-pin lighting receptacle in
accordance with SAE J560, and when specified (see 3.4.11.2), a trailer brake control system,
and associated reinforcements and wiring shall be installed on the rear of the vehicle. The
pintle shall be of the rotating type conforming to AA52550-1 for 4x2 and 4x4 model vehicles,
and AA52550-2 for 6x4 model vehicles. The pintle shall be installed on the chassis frame
with reinforcements to transfer a vertical tongue load of not less than 1800 pounds and a
horizontal drawbar load of not less than 18 000 pounds for 4x2 and 4x4 models; and a
vertical tongue load of not less than 4000 pounds and a horizontal drawbar load of not less
than 40 000 pounds for 6x4 models directly to the chassis rails. The rearmost portion of the
pintle shall be forward, but not more than four inches forward, of the rearmost part of the
vehicle. Two trailer safety chain attachment devices, one adjacent to each side of the pintle,
shall be provided. For 4x2 and 4x4 model vehicles, each attachment device shall provide an
ultimate strength of not less than 18 000 pounds, and the devices shall be capable of
accommodating a standard grab hook (2.19 inches wide, 0.73 inch thick and 0.48 inch throat
width) for a 3/8-inch chain. For 6x4 model vehicles, each attachment device shall provide an
ultimate strength of not less than 40 000 pounds, and the devices shall be capable of
accommodating a standard grab hook (4.56 inches wide, 1.19 inches thick, 0.78 inch throat
width) for a 5/8-inch chain. The lighting receptacle, conforming to SAE J560 with its
conductors connected and color-coded as specified therein, shall be mounted in a readily
accessible location near the pintle.
3.1.1.8 Trailer lighting cable. When specified (see 6.2), a seven-pin, trailer lighting
cable conforming to SAE J1067 shall be furnished. The cable shall be coiled and shall be not
less than 110 inches long when fully extended. Both ends of the cable shall be equipped with
a round plug conforming to SAE J560. The plugs shall be equipped with a grip for
withdrawing from the connector sockets. The cable shall be packaged and stowed in the
vehicle tool compartment.
3.1.1.9 Brushguard. Model 4x4 vehicles shall be equipped with a radiator and
headlamp brushguard. When the headlamps are recessed in and protected by the front
bumper, a headlamp brushguard is not required.
3.1.1.10 Identification and instruction plates. A power takeoff caution notice and
body operating controls, caution, warning and instruction plates shall be provided. Plates
shall conform to composition A, class 1 or 2, or composition C of A-A-50271.
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